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Craftsman 15 gal stationary air compressor won't pump air

The compressor will turn on and try to pump air but won't gain any psi.

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The head needs te be serviced, the valves are bad. Sears has kits for this.

Posted on Feb 09, 2014

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Posted on Jan 02, 2017

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SOURCE: lack of pressure

My air compressor builds up to 40 psi and just keeps running, i have a craftsman 5 GAL, 1HP, 125 PSI and pressure goes up to 40 psi and dose not go any higher and on the other hand engine keeps running and dose not stop. Please advise?
Thanks.
Kia

Posted on Nov 25, 2008

  • 174 Answers

SOURCE: Air compressor motor stalls under pressure

this sounds like a bad pressure switch.if the unit is not shutting off at the same pressure each time this would be the cause.2 if the pressure is not unloading the air pressure on the compressor side of the unit it will cause the unit to struggle when it starts a cycle because the piston is under a load .how this works is say the unit starts from 0 psi when it get to the desired pressure you have it set on the unit kicks off . the other adjustment most units have on them is what pressure to cycle back on.so when the unit reaches say 100 pounds ,it kicks off and bleeds the air off the compressor side so when it starts back up it wont start up with pressure on the piston.

Posted on Jun 22, 2009

  • 4 Answers

SOURCE: craftsman 3 gal air compressor - no air presssure

Check the head gasket. Mine just did the same thing. Mine was blown between the two chambers on top. It's very thin right there. I went to the auto parts store and bought some gasket and made my own for about $6. It's up a working great...finally. BTW the gasket kit is on back order right now at Sear's parts website. It appears we aren't the only ones with the problem!

Posted on Jul 19, 2010

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1 Answer

I have a 3 gal craftsman air compressor. Compressor runs but will not build more than 20 psi in tank reserve. Whats wrong?


if shuts down at 20 psi regulator is set wrong
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More then likely it is either in the valve plate (bad flapper valve or gasket) or the piston and sleeve have worn out which is usually from scoring. You will see that when you take the head off to inspect.

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A piston in any engine should be around 100 psi I would guess. A Chevy 350 used to be around 150 psi. An air compressor that only pumps enough air to reach 20psi is obviously too low on compression. Nailers and the like need 80 or more psi. The intake valves may be shot, the unloader might be stuck or piston rings are worn.

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Oil free pumps do tend to blow the piston ring (not too expensive) available at searsparts.com. Remove covers to pump and manually turn crank until piston is at top and look at the condition of the cylinder neer top, If it looks scratched, order cylinder kit with piston ring. If it looks good and shiney, could be the valve plate in the head. There are reed valves that tend to break. Run pump however with covers removed and check with soapy water for air leaks and repair as needed (air leaks under the cover will prevent unit from filling). Good luck

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Remove the belt and try and turn the pump by hand if it turns free then you have a bad motor and it will need to be replaced

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Air compressor won't go over 40 psi?


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sounds like the regulator is faulty, normal running air should reach 110 psi, this will allow you to run tools...

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